Oh great!!

[howdy20012002]

to truly get rid of the ich, you should leave you tank without any hosts(aka fish) for at least a month.
Removing the fish for a couple of weeks to treat them won't work. The ich will just go dormant till they come back. they can do this for a bout a month before they die off.
I would be very hesitate personally to treat my main tank with copper. This is just my opinion but you will have remains of it in your tank unless you completely sterilize it.